Furnace



Sept. 18 1923. 3,468,498

' A. M. DUVAL ET AL FURNACE Filed Oct. 4. 1921 2 Sheets-Sheet l Di/Z/fl/ Q P P751773 A M a INVENTOR.

A TTORNEY.

Sept. 18,1923. 11,468,4Q8

A DUVAL ET AL BY I ATTORNEY.

Patented Sept. 18, 1923.

- are AUGUST M. IDUVAL AND PORTER. o. rentals, or BRAZIL, INDIANA.

romance.

Application filed October 4, 1921. Serial no. 505,429.

To all whom it may concern.- p

Be itknown that we, Ausus'r M. DUVAL and'PonTE C FARRIS, citizens of the United States, residing at Brazil, in the county of Clayand State of Indiana, have invented certain new and useful Improvements, in Furnaces, of which the following is a specification. i

This invention relates to furnacesand more particularly tocoal direct fired furnaces. y 7 y The primary object of this invention is to provide a furnaceof this character so constructed as to burn successfully a kiln of brick or other clay productsw'ith the'minimum amount of fuel in'the least number of hours. without injury to the ware. a r

A further object of this invention is to provide a furnace so constructed as to supply pre-heated air to the fuel used which will materially assist in combustion.

. A further object of this invention; is to provide a furnace which will eliminate kiln hub expansion by reason of a large column of air being forced through air passages of .the kilnv hubs to the furnace, thereby prolonging the life of the kiln.

A .still further object is to provide afurnace of this character which may be used in connection with alltypes of kilns.

With these and other objects in view, the invention consists in certain novel features of construction as hereinafter shown, described and claimed.

In the accompanying drawings:

Figure 1 represents a front elevation of a furnace embodying this invention, with the doors and frames omitted.

Figure 2 is a horizontal section taken on the line 2-2 of Fig. 1, and a Figure 3 isa detail vertical section-taken on the line of Fig. 2.

In. the embodiment illustrated a furnace 1 is shown, designed to be used in connection with any kind or typeof'kiln and which is equipped with the usual ash boX 2 having a fire bOX.4: arranged there-over provided -with a grate 3. between them. The fire box has the 'usual front openingfor the fuel as shown at 5.

A cold air feed pipe 10 of suitable size, is preferably mounted across the front of thefurnace as is'show n clearly inrEig. 1 and has leading therefrom at longitudinally 1 Fig. 8,.

' spaced points, lateral pipes or flues 11 and 12 which extend downwardly at points on opposite sides of the firebox opening 5. Leading from each of said lateral flues 11 and 12, are air liues,13, 1d and 15 which connect with built in air passages through the side walls of the furnace 1 and open into the fire bOX above and underneath the grates. The two pipes or flues 13 and 1 1 may be termed the pre-heated air fines and are arranged in the same horizontal plane, while the fines 15, one of which is arranged at each side of the fire box may be termed the preheated air fines for air combustion and are positioned in aplane above the fines 13 and Has is shown clearly in However, flues 15 may be placed underneath and near the center of the grates to supply air for the burning of such fuel as slack or lignite coal. I

The arrangementof the flues 13, 1.4: and 15 in the side walls of the furnace 1 operates to eliminate expansion in the kiln hubs thereby prolonging the life of the kiln and. at the same time the pro-heated air fed through these fluesrto the fire box assists in the burning of the fuel used, which will result in effecting a saving of from fifteen to twenty percent in'fuel, while the principle of forced draft will advance. the burning time of the ware in the kiln in connection with which the furnace'is employed from fifteen to twenty per cent.

Each of the fines 18, 14: and 15 is equipped with a valve or damper 16 provided with an operating handle 17 as is shown clearly in Fig. 3. The air supplied through theflues 13, 14; and Kris furnished mechanically by an exhaust fan operated by any mode of power and which is not shown in the drawing.

The pro-heated air flues 15 are designed to be used for the combustion of gases from the fuel bed passing into the combustion chamber at the end of the grate and these gasesare ignited by admission of oxygen supplied mechanically and controlled by the valve 16 with which the lines 15 are equipped. j

The preferred embodiment of the invention is disclosed in the drawings and set forth in the specification, but it will beunderstood that any modifications within the scope ofthe claimed invention may be made in the construction without departing from the principle of the invention or sacrificlng any of its advantages.

iVe claim:

1. In a furnace structure a body portion having means to constitute a fire box, bridge wall, an ash pit and grate bars interposed between the box and pit, said body portion further provided at each side of the fire box with a pair of horizontally disposed air conducting flues leading from the front of the body portion, the flues of each pair opening into the front and rear of the fire box throughone side thereof above the grate bars forwardly of the bridge wall, and said body portion further provided at each side of the fire box with an air conducting flue leading from the front of the body portion and opening into the ash pit through a side wall thereof below the grate bars forwardly of andindependent of the bridge wall.

2. Ina furnace structure a body portion having means .to' constitute a fire box, a bridgewall, anash pit and grate bars interposed between the box and pit, said body portio further provided at each side of the fire box with a pair of horizontally dis posed air conducting fiues leading from the front of the bodyportion, the fines of each pair opening into the front and rear of the fire box through one side thereof above the grate bars forwardly of the bridge wall, and said bodyportion further provided at each side of the fire box with an'air conducting flue leading from the front of the body portion and opening into the ash pit through 7 a side wall thereof below the grate bars forwardly of and independent of the bridge wall, each of the flues'opening into the ash pit having itsdischarge end positioned contrally with respect to the discharge ends of a pair of fines opening into the fire box.

3. In a furnace structure a body portion having means to constitute a fire box, a bridge walhan ash pit and grate bars inter posed between the box and pit, said body portion further provided at each side of the fire boxwith a pair of horizontally disposed air conducting fines leading from the front of the body portion, the fines of each pair opening into the front and rearof the fire box through one side thereof above the grate bars forwardly of the bridge wall, and said body portion further providedat each side of the fire box with an air conducting flue leading from the front of the body portion and opening into the ash pit through a side wall thereofbelow the grate bars forwardly of and independent of the bridge wall, each of the fines opening into the ash pit having its discharge end positioned centrally with respect to the dischargeends of a pair of fines opening into the fire box, the inner portions of the flues of said pairs of fines curving towards the fire box, and the inner por tion of each of said other fiues curving to- I wards the ash pit. V V

4. In a furnace structure a body portion having means to constitute a fire box, a

bridge wall, an ash pit and grate bars interposed between theboxand .pit, said body portion further provided at each side of the fire box with a pair of horizontally disposed air conducting flues leading from the front ofthe body portion, "the fiues of each pair opening into the front and rear of the fire box through one side thereof above the grate bars forwardly of the bridge wall, andsaid body portion further provided at each side of the fire box witha-n air conducting flue leading from thefront'of the body portion and opening into the ash pit through a side" wall thereof below the grate bars forwardly of and independent of the bridge wall, an independent air supply pipe arranged exteriorly of the front of said bodyportionf andcommunicating with the outer end of each flue and further provided with a conbox throughfone side thereof above the grate bars forwardly of the bridge wall, andisaid body portion further provided .at eaclrside of the fire box with an air conducting flue leading from the front'of the body portion and opening into the ash pit through a side wallthereof below the grate bars forwardly of and independent of thebridge wall, the said fines-communicating with the ash pit arranged fora portion of their length above the other of said fiuesand each having its pending from the remainingportion thereof. i

bridge wa'll, an ash pit and grate bars interposed between the box and pit, said body portion further provided ateach side of the 6. In a furnace structure body portion 7 having means to constitute a fire box, a

firebox witha pair of horizontally disposed air conducting flues leading from the'front of the body: portion, the fiues of'each pair opening into the front and rear of the fire box through one side thereof. above the grate bars forwardly of the bridge wall,-said body portion further provided at each side of the firebox with an airconducting flue leading from the front of the jbody p ortion and o'pening into the ash pit through: a sidewall thereof belo'w the grate bars, forwardly of and independent of the bridge wall, the e112 11a inner portion of L-shapecontour and de trance ends of the flues which open below the fire box being arranged above the entrance ends of the other of the fines, a pair of vertically disposed fiues arranged at the front of said body portion, a series of branches leading from each of said vertical flues to the entrances of the flues at each side of the fire box, a common air supply pipe for said vertical fines, and a damper mounted in each of said branches.

In testimony whereof, we affix our signatures hereto.

AUGUEST M. DUVAL. PORTER C. FARRIS. 

